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Business Purpose Residential Loans (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	1,486	2,013
Total Principal	$ 1,034,434,000	$ 1,409,179,000
Purchases of held-for-sale loans	7,162,131,000	5,705,842,000	$ 4,953,619,000
Proceeds from sales of held-for-sale loans	5,383,313,000	3,903,147,000	$ 4,192,671,000
Business purpose residential loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Residential loans	141,258,000	0
Single-family rental loans, held-for-sale at fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Residential loans	$ 28,460,000	0
Number of Loans | loan	11
Total Principal	$ 27,566,000
Number of loans past due | loan	0
Number of loans in foreclosure | loan	0
Purchases of held-for-sale loans	$ 28,000,000
Proceeds from sales of held-for-sale loans	0
Gain (loss) on investments	300,000
Collateral amounts	$ 28,000,000
Loans maturity, one	5 years
Loans maturity, two	7 years
Loans maturity, three	10 years
Weighted average coupon rate	5.90%
Contract maturities	7 years
Weighted average original loan-to-value (LTV)	64.00%
Weighted-average debt service coverage ratio	1.29
Residential bridge loans held-for-investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Residential loans	$ 112,798,000	$ 0
Number of Loans | loan	157
Total Principal	$ 112,360,000
Number of loans past due | loan	7
Number of loans in foreclosure | loan	0
Purchases of held-for-sale loans	$ 140,000,000
Proceeds from sales of held-for-sale loans	0
Gain (loss) on investments	(100,000)
Collateral amounts	$ 98,000,000
Weighted average coupon rate	9.16%
Weighted average original loan-to-value (LTV)	76.00%
Unpaid principal balance on delinquent or foreclosure loans	$ 12,000,000
Weighted average original Fair Isaac Corporation (FICO) score	698
Estimated rehabilitated loan-to-value ratio	59.00%
Residential bridge loans held-for-investment | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Contract maturities	6 months
Residential bridge loans held-for-investment | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Contract maturities	24 months

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